US5332797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone release compositions
Assignee: 3M Co
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Filing: 1992-04-01
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Granted: 1994-07-26
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Expires: 2012-04-01
Abstract
Abstract A composite structure comprising a substrate bearing a layer of release coating prepared from one or more epoxypolysiloxanes together providing cycloaliphatic epoxy group(s) and non-cycloaliphatic (i.e., linear or branched aliphatic) epoxy group(s). The resulting release coating cures quickly and exhibits low release levels to adhesives. An oligomeric epoxypolysiloxane comprising both cycloaliphatic and non-cycloaliphatic epoxy groups is also disclosed.
Inventors
- 👤 Carl R. Kessel
- 👤 Maureen C. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:10
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/06; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C09D5/00; C09D5/20; C09J; C09J7/00; C09J7/40; C09J7/401; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/2848; Y10T428/2852; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
261 words
An oligomeric epoxypolysiloxane of the formula ##STR19## wherein R is a lower alkyl group having one to three carbon atoms, R l is a monovalent hydrocarbon group of 4 to 20 carbon atoms, E is a monovalent linear or branched aliphatic epoxy group; G is a monovalent cycloaliphatic epoxy group; M is a silyl group selected from the group consisting of R 3 Si--, R 2 R 1 Si--, RR 1 2 Si--, R 1 3 Si--, R 2 ESi--, RE 2 Si--, E 3 Si--, R 1 2 ESi--, R 1 E 2 Si--, RR 1 ESi--, R 2 GSi, RG 2 Si--, G 3 Si--, R 1 2 GSi--, R 1 G 2 Si--, RR 1 GSi--, REGSi--, E 2 GSi--, G 2 ESi--, and R 1 EGSi--, in which R, R 1 , E and G are defined above; y is zero or a number having a value of up to about 200; w is zero or a number having a value of up to about 200-y; x is zero or a number having a value of up to about 185; z is zero or a number having a value of up to about 135; and q is a number having a value of 1 to about 75; with the proviso that said epoxypolysiloxane comprises at least one G group and one E group, the ratio of G to E groups is from about 1:10 to 2:1, and the total number of E and G groups is about 5 to 50% of the total number of siloxane units.
Claim 2
Dependent Claim
261 words
An oligomeric epoxypolysiloxane of the formula ##STR19## wherein R is a lower alkyl group having one to three carbon atoms, R l is a monovalent hydrocarbon group of 4 to 20 carbon atoms, E is a monovalent linear or branched aliphatic epoxy group; G is a monovalent cycloaliphatic epoxy group; M is a silyl group selected from the group consisting of R 3 Si--, R 2 R 1 Si--, RR 1 2 Si--, R 1 3 Si--, R 2 ESi--, RE 2 Si--, E 3 Si--, R 1 2 ESi--, R 1 E 2 Si--, RR 1 ESi--, R 2 GSi, RG 2 Si--, G 3 Si--, R 1 2 GSi--, R 1 G 2 Si--, RR 1 GSi--, REGSi--, E 2 GSi--, G 2 ESi--, and R 1 EGSi--, in which R, R 1 , E and G are defined above; y is zero or a number having a value of up to about 200; w is zero or a number having a value of up to about 200-y; x is zero or a number having a value of up to about 185; z is zero or a number having a value of up to about 135; and q is a number having a value of 1 to about 75; with the proviso that said epoxypolysiloxane comprises at least one G group and one E group, the ratio of G to E groups is from about 1:10 to 2:1, and the total number of E and G groups is about 5 to 50% of the total number of siloxane units.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |